Custom Authentication Provider and User Details

[kmsheph]

I am unable to paste my code in so there may be some typos.
CustomProviderAuthentication

public class CustomAuthenticationProvider implements AuthenticationProvider {

@Resource DataSource dataSource;

public Authentication authenticate(Authentication authentication) throws AuthenticationException {
UsernamePasswordAuthenticationToken auth = (UsernamePasswordAuthenticationToken) authentication;
String username = String.valueOf(auth.getPrincipal());
String password = String.valueOf(auth.getCredentials());
Connection conn = null;
try{
   //In this call I use the username and password and pass them to my oracle proxy connection and then try to    connect to the database 
   conn = dataSourceAdapter.doGetConnection(username, password);
}
catch(SQLException sqle) {
 throw new BadCredentialsException(LoginException.handleLoginErrors(sqle));
}
//I use the same connection to get the granted authorities, user's role and user's id
return new UsernamePasswordAuthenticationToken(username, password,new GrantedAuthority[] {new GrantedAuthorityImpl(userRole)});
}

It works well for testing the database connection.